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#1 Created at ... [Delete] [Delete and Lock User] 
static List<Message> process(List<Message> received) {
	    // TODO: 按sequence去除重复消息
    Set<Message> set = new TreeSet<>(new Comparator<Message>(){
        public int compare(Message m1, Message m2){
             return m1.sequence.compareTo(m2.sequence);
        }
    });
    set.addAll(received);    
    return new ArrayList<Message>(set);
}

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#2 Created at ... [Delete] [Delete and Lock User]

compareTo是用来比较String，代码报错

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